given tamerlan tsarnaev's extensive postings of jihaddist videos, it strikes some as peculiar that the f.b.i. just did not follow up. >> if the fssb, the russian internal security services told us that someone was involved with the chechens, that would, in my mind, necessitate significant coverage for a period of a sustained period of time. did that happen? this is going to be the question for the bureau. they're going to have to answer these things. >> and the mother of the two suspects told russian television on friday that her son was controlled by the f.b.i. for three to five years, quoting from her, they knew what my son was doing. they knew actions and on what sites the internet he was going, end quote. in a statement that extensively praises the f.b.i.'s handling the case, the house homeland security chairman mike mccall left open this window for further exploration of this. quote, in the coming weeks, the homeland security committee will ask how this happened and how we can prevent it from happening again. chechnya is an overwhelmingly muslim region noted for its especially rut